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Tolerance and wear compensation of a fuel pump

a fuel pump and tolerable technology, applied in the direction of charge feed system, electrical control, non-positive displacement fluid engine, etc., can solve the problems of natural wear, deviation between the actual delivery quantity and the set delivery quantity of the fuel pump, and the degree of inaccuracy of open-loop controlled fuel delivery, so as to reduce the energy consumption of such a fuel pump and improve the co2 balance of the device operated

Active Publication Date: 2021-12-21
VITESCO TECH GERMANY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention aims to improve fuel delivery accuracy and reduce energy consumption by shutting off fuel supply under certain conditions. The first method uses partial or complete shutting off of a fuel-conducting point to determine the inflection point of the fuel pump, which compensates for inaccuracies in fuel delivery. This helps save energy and improve CO2 balance in devices equipped with an internal combustion engine. The second method calibrates the fuel delivery without the need for hardware sensors, thereby achieving cost-efficient energy savings.

Problems solved by technology

Open-loop controlled delivery fuel is subject to a certain degree of inaccuracy, caused, on one hand, by production-related component tolerance of the fuel pump and, on the other hand, by wear of the fuel pump.
Such natural wear occurs, in particular, with what is referred to as a positive displacement pump—i.e., a pump which operates according to what is referred to as the positive displacement principle—and occurs increasingly over its service life so that a deviation between a delivery quantity which actually occurs and a set delivery quantity of the fuel pump becomes increasingly pronounced over its service life.
The component tolerance of the fuel pump is in turn dependent on wear so that it changes over the service life of the fuel pump.
Both the component tolerance and the state of wear of the fuel pump have until now not been allowed for in a fuel supply system having solely open-loop control.
It is also the case that a development of wear of the fuel pump cannot be reliably predicted.
However, this requires increased energy consumption of the fuel pump.

Method used

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  • Tolerance and wear compensation of a fuel pump
  • Tolerance and wear compensation of a fuel pump
  • Tolerance and wear compensation of a fuel pump

Examples

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Embodiment Construction

[0048]Identical features or features having an identical effect are denoted by the same reference signs throughout the figures.

[0049]FIG. 1 illustrates a fuel supply system 2 with solely open-loop control, according to the prior art. An engine control unit 4 outputs a rotational speed request to a pump control unit 8 as a function of an operating point of an internal combustion engine, which pump control unit 8 has a communication connection to the engine control unit 4. The pump control unit 8 then itself actuates a fuel pump 12—also referred to as a pre-delivery pump—which is operated by an electric motor and is as such part of what is referred to as a fuel delivery unit 10. The rotational speed request nA results, e.g., from a transmission characteristic curve in the form of a three-dimensional characteristic curve 6 which can be extended, e.g., over a rotational speed nVM and a load rl of the internal combustion engine. However, the transmission characteristic curve could equall...

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PUM

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Abstract

A method for calibrating a fuel pump for use in a fuel supply system of a device having internal combustion engine includes determining a tolerance-conditioned and wear-conditioned deviation of the fuel pump with respect to its delivery behavior so that the calibration permits energy-consumption-optimized actuation of the fuel pump.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a U.S. national stage of International application No. PCT / EP2018 / 079936, filed on Nov. 1, 2018, which claims priority to German Application No. 10 2017 221 342.6, filed Nov. 28, 2017, the content of each of which is incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The invention relates to a method for determining a component tolerance and a state of wear of a fuel pump provided for a fuel supply system for use in a device equipped with an internal combustion engine. The invention also relates to a method for calibrating such a fuel pump.2. Description of the Prior Art[0003]Devices or systems in this regard are any type of device or system equipped with an internal combustion engine and supplied with a liquid fuel for operation, these being in particular passenger cars and / or utility vehicles but also stationary or mobile power generators. A liquid fuel is understood here to be, in particu...

Claims

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Application Information

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IPC IPC(8): F02D41/30F02M37/18F02D41/24F02D41/38F02D41/22F02M37/08F04D15/00
CPCF02D41/3082F02D41/248F02D41/2432F02D41/2438F02D41/2464F02D41/3836F02M37/18F02D41/2441F02D2041/224F02D2200/0602F02M37/08F04D15/0066F04D15/0088F02M37/14
Inventor KLEINEBERG, STEFANABDELMALEK, MARIZVÖLKER, MARCSAUSNER, ANDREAS
Owner VITESCO TECH GERMANY GMBH
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